자기펄스압축성형장치를 이용한 대면적 지르코니아 덴탈블록 제조 연구
Fabrication of Ceramic Dental Block by Magnetic Pulsed Compaction
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Sintered bulks of ZrO2 nanopowders were fabricated by magnetic pulsed compaction (MPC) and subsequent two-step sintering employed in this study and the formability effects of nanopowder on mixing condition, pressure and sintering temperature were investigated. The addition of PVA induced and increase in the formability of the sintered bulk. But cracked bulks were obtained on sintering with addition of over 10 wt% PVA due to generation of crack during sintering. The optimum compaction pressure during MPC was 1.0 GPa and mixing conditions included using 5.0wt% PVA. The optimum processing condition included MPC process, followed by two-step sintering (first at 1000 and then at 1450oC). The sintered bulks with the diameter of 30 mm under these conditions were found to have non crack,~99% density.
Abstract
Sintered bulks of ZrO2 nanopowders were fabricated by magnetic pulsed compaction (MPC) and subsequent two-step sintering employed in this study and the formability effects of nanopowder on mixing condition, pressure and sintering temperature were investigated. The addition of PVA induced and increase in the formability of the sintered bulk. But cracked bulks were obtained on sintering with addition of over 10 wt% PVA due to generation of crack during sintering. The optimum compaction pressure during MPC was 1.0 GPa and mixing conditions included using 5.0wt% PVA. The optimum processing condition included MPC process, followed by two-step sintering (first at 1000 and then at 1450oC). The sintered bulks with the diameter of 30 mm under these conditions were found to have non crack,~99% density.
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